import pygame.font

class Button:
    def __init__(self,ai_game,msg):
        """"初始化按钮的属性"""
        self.screen = ai_game.screen
        self.screen_rect = self.screen.get_rect()

        #设置按钮的尺寸和其他属性
        self.width,self.height = 200,50
        self.button_color = (60,120,80)
        self.text_color = (255,255,255)
        self.font = pygame.font.SysFont(None,48)

        #创建按钮的rect对象，并使其居中
        self.rect = pygame.Rect(0,0,self.width,self.height)
        self.rect.center = self.screen_rect.center

        #按钮的标签只需创建一次
        self._prep_msg(msg)

    def _prep_msg(self,msg):
        """将msg渲染为图像，并使其在按钮上居中"""
        self.msg_image= self.font.render(msg,True,self.text_color,
                                        self.button_color)
        self.msg_image_rect = self.msg_image.get_rect()
        self.msg_image_rect.center = self.rect.center

    def draw_button(self):
        #创建一各用颜色填充的按钮，在绘制文本
        self.screen.fill(self.button_color,self.rect)
        self.screen.blit(self.msg_image,self.msg_image_rect)